diff --git a/app-ios/DroidKaigi2022/DroidKaigi2022.xcodeproj/project.pbxproj b/app-ios/DroidKaigi2022/DroidKaigi2022.xcodeproj/project.pbxproj
index ce4199940..78673cf0f 100644
--- a/app-ios/DroidKaigi2022/DroidKaigi2022.xcodeproj/project.pbxproj
+++ b/app-ios/DroidKaigi2022/DroidKaigi2022.xcodeproj/project.pbxproj
@@ -324,6 +324,7 @@
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = iOS/Info.plist;
+				INFOPLIST_KEY_NSCalendarsUsageDescription = "Use for adding event to calendar";
 				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
 				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
@@ -356,6 +357,7 @@
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = iOS/Info.plist;
+				INFOPLIST_KEY_NSCalendarsUsageDescription = "Use for adding event to calendar";
 				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
 				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
diff --git a/app-ios/DroidKaigi2022/iOS/Info.plist b/app-ios/DroidKaigi2022/iOS/Info.plist
index f267fdc14..c81e290ae 100644
--- a/app-ios/DroidKaigi2022/iOS/Info.plist
+++ b/app-ios/DroidKaigi2022/iOS/Info.plist
@@ -2,12 +2,12 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>CFBundleLocalizations</key>
+	<array>
+		<string>en</string>
+		<string>ja</string>
+	</array>
 	<key>ITSAppUsesNonExemptEncryption</key>
 	<false/>
-    <key>CFBundleLocalizations</key>
-    <array>
-    <string>en</string>
-    <string>ja</string>
-    </array>
 </dict>
 </plist>
diff --git a/app-ios/Package.swift b/app-ios/Package.swift
index f410bada7..61cfcef93 100644
--- a/app-ios/Package.swift
+++ b/app-ios/Package.swift
@@ -69,6 +69,7 @@ var package = Package(
                 .target(name: "Auth"),
                 .target(name: "Container"),
                 .target(name: "ContributorFeature"),
+                .target(name: "Event"),
                 .target(name: "MapFeature"),
                 .target(name: "SponsorFeature"),
                 .target(name: "Theme"),
@@ -133,6 +134,9 @@ var package = Package(
                 .product(name: "ComposableArchitecture", package: "swift-composable-architecture"),
             ]
         ),
+        .target(
+            name: "Event"
+        ),
         .target(
             name: "MapFeature",
             dependencies: [
@@ -156,6 +160,7 @@ var package = Package(
             name: "SearchFeature",
             dependencies: [
                 .target(name: "CommonComponents"),
+                .target(name: "Event"),
                 .target(name: "SessionFeature"),
                 .product(name: "ComposableArchitecture", package: "swift-composable-architecture"),
             ]
@@ -166,6 +171,7 @@ var package = Package(
                 .target(name: "appioscombined"),
                 .target(name: "Assets"),
                 .target(name: "CommonComponents"),
+                .target(name: "Event"),
                 .target(name: "Model"),
                 .target(name: "Theme"),
                 .product(name: "ComposableArchitecture", package: "swift-composable-architecture"),
diff --git a/app-ios/Sources/AppFeature/AppView.swift b/app-ios/Sources/AppFeature/AppView.swift
index 4a48153c0..00789cdcf 100644
--- a/app-ios/Sources/AppFeature/AppView.swift
+++ b/app-ios/Sources/AppFeature/AppView.swift
@@ -5,6 +5,7 @@ import Assets
 import Auth
 import ComposableArchitecture
 import Container
+import Event
 import MapFeature
 import SearchFeature
 import SessionFeature
@@ -65,19 +66,22 @@ public struct AppEnvironment {
     public let sessionsRepository: SessionsRepository
     public let announcementsRepository: AnnouncementsRepository
     public let staffRepository: StaffRepository
+    public let eventKitClient: EventKitClientProtocol
 
     public init(
         contributorsRepository: ContributorsRepository,
         sponsorsRepository: SponsorsRepository,
         sessionsRepository: SessionsRepository,
         announcementsRepository: AnnouncementsRepository,
-        staffRepository: StaffRepository
+        staffRepository: StaffRepository,
+        eventKitClient: EventKitClientProtocol
     ) {
         self.contributorsRepository = contributorsRepository
         self.sponsorsRepository = sponsorsRepository
         self.sessionsRepository = sessionsRepository
         self.announcementsRepository = announcementsRepository
         self.staffRepository = staffRepository
+        self.eventKitClient = eventKitClient
     }
 }
 
@@ -90,7 +94,8 @@ public extension AppEnvironment {
             sponsorsRepository: container.get(type: SponsorsRepository.self),
             sessionsRepository: container.get(type: SessionsRepository.self),
             announcementsRepository: container.get(type: AnnouncementsRepository.self),
-            staffRepository: container.get(type: StaffRepository.self)
+            staffRepository: container.get(type: StaffRepository.self),
+            eventKitClient: EventKitClient()
         )
     }
 
@@ -100,7 +105,8 @@ public extension AppEnvironment {
             sponsorsRepository: FakeSponsorsRepository(),
             sessionsRepository: FakeSessionsRepository(),
             announcementsRepository: FakeAnnouncementsRepository(),
-            staffRepository: FakeStaffRepository()
+            staffRepository: FakeStaffRepository(),
+            eventKitClient: EventKitClientMock()
         )
     }
 }
@@ -147,7 +153,8 @@ public let appReducer = Reducer<AppState, AppAction, AppEnvironment>.combine(
         action: /AppAction.search,
         environment: {
             .init(
-                sessionsRepository: $0.sessionsRepository
+                sessionsRepository: $0.sessionsRepository,
+                eventKitClient: $0.eventKitClient
             )
         }
     ),
@@ -155,7 +162,10 @@ public let appReducer = Reducer<AppState, AppAction, AppEnvironment>.combine(
         state: \.sessionState,
         action: /AppAction.session,
         environment: {
-            .init(sessionsRepository: $0.sessionsRepository)
+            .init(
+                sessionsRepository: $0.sessionsRepository,
+                eventKitClient: $0.eventKitClient
+            )
         }
     ),
     .init { state, action, _ in
diff --git a/app-ios/Sources/Event/Event.swift b/app-ios/Sources/Event/Event.swift
new file mode 100644
index 000000000..197ec75ac
--- /dev/null
+++ b/app-ios/Sources/Event/Event.swift
@@ -0,0 +1,48 @@
+import EventKit
+import UIKit
+
+public protocol EventKitClientProtocol {
+    func requestAccessIfNeeded() async throws -> Bool
+    func addEvent(
+        title: String,
+        startDate: Date,
+        endDate: Date
+    ) throws
+}
+
+public struct EventKitClient: EventKitClientProtocol {
+    private let eventStore = EKEventStore()
+
+    public init() {}
+
+    public func requestAccessIfNeeded() async throws -> Bool {
+        switch EKEventStore.authorizationStatus(for: .event) {
+        case .denied, .restricted:
+            let _ = await UIApplication.shared.open(URL(string: UIApplication.openSettingsURLString)!)
+        case .authorized:
+            return true
+        case .notDetermined:
+            break
+        @unknown default:
+            break
+        }
+        return try await eventStore.requestAccess(to: .event)
+    }
+
+    public func addEvent(
+        title: String,
+        startDate: Date,
+        endDate: Date
+    ) throws {
+        guard let defaultCalendar = eventStore.defaultCalendarForNewEvents else {
+            return
+        }
+        let event = EKEvent(eventStore: eventStore)
+        event.title = title
+        event.startDate = startDate
+        event.endDate = endDate
+        event.calendar = defaultCalendar
+
+        try eventStore.save(event, span: .thisEvent)
+    }
+}
diff --git a/app-ios/Sources/Event/Mock.swift b/app-ios/Sources/Event/Mock.swift
new file mode 100644
index 000000000..5643830b6
--- /dev/null
+++ b/app-ios/Sources/Event/Mock.swift
@@ -0,0 +1,11 @@
+import Foundation
+
+public struct EventKitClientMock: EventKitClientProtocol {
+    public init() {}
+    
+    public func requestAccessIfNeeded() async throws -> Bool {
+        return true
+    }
+
+    public func addEvent(title: String, startDate: Date, endDate: Date) throws {}
+}
diff --git a/app-ios/Sources/SearchFeature/SearchView.swift b/app-ios/Sources/SearchFeature/SearchView.swift
index ce945dd10..351580162 100644
--- a/app-ios/Sources/SearchFeature/SearchView.swift
+++ b/app-ios/Sources/SearchFeature/SearchView.swift
@@ -1,5 +1,6 @@
 import CommonComponents
 import ComposableArchitecture
+import Event
 import Model
 import SessionFeature
 import SwiftUI
@@ -34,11 +35,14 @@ public enum SearchAction {
 
 public struct SearchEnvironment {
     public let sessionsRepository: SessionsRepository
+    public let eventKitClient: EventKitClientProtocol
 
     public init(
-        sessionsRepository: SessionsRepository
+        sessionsRepository: SessionsRepository,
+        eventKitClient: EventKitClientProtocol
     ) {
         self.sessionsRepository = sessionsRepository
+        self.eventKitClient = eventKitClient
     }
 }
 
@@ -47,7 +51,10 @@ public let searchReducer = Reducer<SearchState, SearchAction, SearchEnvironment>
         state: \.sessionState,
         action: /SearchAction.session,
         environment: {
-            .init(sessionsRepository: $0.sessionsRepository)
+            .init(
+                sessionsRepository: $0.sessionsRepository,
+                eventKitClient: $0.eventKitClient
+            )
         }
     ),
     .init { state, action, environment in
@@ -101,7 +108,6 @@ public let searchReducer = Reducer<SearchState, SearchAction, SearchEnvironment>
     }
 )
 
-
 public struct SearchView: View {
     private let store: Store<SearchState, SearchAction>
 
@@ -188,7 +194,8 @@ struct SearchView_Previews: PreviewProvider {
                 ),
                 reducer: .empty,
                 environment: SearchEnvironment(
-                    sessionsRepository: FakeSessionsRepository()
+                    sessionsRepository: FakeSessionsRepository(),
+                    eventKitClient: EventKitClientMock()
                 )
             )
         )
diff --git a/app-ios/Sources/SessionFeature/SessionView.swift b/app-ios/Sources/SessionFeature/SessionView.swift
index 901bb61ad..854eecd35 100644
--- a/app-ios/Sources/SessionFeature/SessionView.swift
+++ b/app-ios/Sources/SessionFeature/SessionView.swift
@@ -1,6 +1,7 @@
 import appioscombined
 import Assets
 import ComposableArchitecture
+import Event
 import Model
 import SwiftUI
 import Theme
@@ -8,6 +9,7 @@ import Theme
 public struct SessionState: Equatable {
     public var timetableItemWithFavorite: TimetableItemWithFavorite
     public var isShareSheetShown: Bool = false
+    public var eventAddConfirmAlert: AlertState<SessionAction>?
 
     public init(timetableItemWithFavorite: TimetableItemWithFavorite) {
         self.timetableItemWithFavorite = timetableItemWithFavorite
@@ -20,13 +22,21 @@ public enum SessionAction {
     case tapFavorite
     case tapShare
     case hideShareSheet
+    case showEventAddConfirmAlert
+    case hideEventAddConfirmAlert
+    case addEvent
 }
 
 public struct SessionEnvironment {
     public let sessionsRepository: SessionsRepository
+    public let eventKitClient: EventKitClientProtocol
 
-    public init(sessionsRepository: SessionsRepository) {
+    public init(
+        sessionsRepository: SessionsRepository,
+        eventKitClient: EventKitClientProtocol
+    ) {
         self.sessionsRepository = sessionsRepository
+        self.eventKitClient = eventKitClient
     }
 }
 
@@ -34,8 +44,11 @@ public let sessionReducer = Reducer<SessionState, SessionAction, SessionEnvironm
 
     switch action {
     case .tapCalendar:
-        return .run { @MainActor _ in
-            // TODO: Add event using EventKit
+        let timetableItem = state.timetableItemWithFavorite.timetableItem
+        return .run { @MainActor subscriber in
+            if try await environment.eventKitClient.requestAccessIfNeeded() {
+                subscriber.send(.showEventAddConfirmAlert)
+            }
         }
         .receive(on: DispatchQueue.main.eraseToAnyScheduler())
         .eraseToEffect()
@@ -60,6 +73,36 @@ public let sessionReducer = Reducer<SessionState, SessionAction, SessionEnvironm
     case .hideShareSheet:
         state.isShareSheetShown = false
         return .none
+    case .showEventAddConfirmAlert:
+        state.eventAddConfirmAlert = .init(
+            title: .init(StringsKt.shared.session_event_add_confirm.localized()),
+            buttons: [
+                .cancel(
+                    .init(StringsKt.shared.session_event_add_confirm_cancel.localized()),
+                    action: .send(.hideEventAddConfirmAlert)
+                ),
+                .default(
+                    .init(StringsKt.shared.session_event_add_confirm_ok.localized()),
+                    action: .send(.addEvent)
+                ),
+            ]
+        )
+        return .none
+    case .hideEventAddConfirmAlert:
+        state.eventAddConfirmAlert = nil
+        return .none
+    case .addEvent:
+        let timetableItem = state.timetableItemWithFavorite.timetableItem
+        do {
+            try environment.eventKitClient.addEvent(
+                title: timetableItem.title.jaTitle,
+                startDate: timetableItem.startsAt.toDate(),
+                endDate: timetableItem.endsAt.toDate()
+            )
+        } catch let e {
+            print(e)
+        }
+        return .none
     }
 }
 
@@ -162,6 +205,7 @@ public struct SessionView: View {
             .sheet(isPresented: viewStore.binding(get: { $0.isShareSheetShown }, send: .hideShareSheet)) {
                 ShareTextView(text: timetableItem.shareText)
             }
+            .alert(store.scope(state: \.eventAddConfirmAlert), dismiss: .hideEventAddConfirmAlert)
         }
     }
 }
@@ -173,7 +217,10 @@ struct SessionView_Previews: PreviewProvider {
             store: .init(
                 initialState: .init(timetableItemWithFavorite: TimetableItemWithFavorite.companion.fake()),
                 reducer: .empty,
-                environment: SessionEnvironment(sessionsRepository: FakeSessionsRepository())
+                environment: SessionEnvironment(
+                    sessionsRepository: FakeSessionsRepository(),
+                    eventKitClient: EventKitClientMock()
+                )
             )
         )
     }
diff --git a/core/model/src/commonMain/resources/MR/base/strings.xml b/core/model/src/commonMain/resources/MR/base/strings.xml
index 916fda42c..a499e43d1 100644
--- a/core/model/src/commonMain/resources/MR/base/strings.xml
+++ b/core/model/src/commonMain/resources/MR/base/strings.xml
@@ -48,6 +48,9 @@
     <string name="session_slide">スライド</string>
     <string name="session_language_interpretation">(同時通訳)</string>
     <string name="session_cancel">このセッションは事情により中止となりました</string>
+    <string name="session_event_add_confirm">イベントを追加します。</string>
+    <string name="session_event_add_confirm_ok">OK</string>
+    <string name="session_event_add_confirm_cancel">キャンセル</string>
 
     <!-- Setting -->
     <string name="setting_title">設定</string>
diff --git a/core/model/src/commonMain/resources/MR/en/strings.xml b/core/model/src/commonMain/resources/MR/en/strings.xml
index 529611adb..8ac9640fb 100644
--- a/core/model/src/commonMain/resources/MR/en/strings.xml
+++ b/core/model/src/commonMain/resources/MR/en/strings.xml
@@ -48,6 +48,9 @@
     <string name="session_slide">SLIDE</string>
     <string name="session_language_interpretation">(interpretation)</string>
     <string name="session_cancel">このセッションは事情により中止となりました</string>
+    <string name="session_event_add_confirm">Add an event</string>
+    <string name="session_event_add_confirm_ok">OK</string>
+    <string name="session_event_add_confirm_cancel">Cancel</string>
 
     <!-- Setting -->
     <string name="setting_title">Setting</string>
diff --git a/core/model/src/commonMain/resources/MR/zh/strings.xml b/core/model/src/commonMain/resources/MR/zh/strings.xml
index 3a06c6529..e3094e9cf 100644
--- a/core/model/src/commonMain/resources/MR/zh/strings.xml
+++ b/core/model/src/commonMain/resources/MR/zh/strings.xml
@@ -49,6 +49,9 @@
     <!-- TODO:Translation into Chinese -->
     <string name="session_language_interpretation">(interpretation)</string>
     <string name="session_cancel">このセッションは事情により中止となりました</string>
+    <string name="session_event_add_confirm">Add an event</string>
+    <string name="session_event_add_confirm_ok">OK</string>
+    <string name="session_event_add_confirm_cancel">Cancel</string>
 
     <!-- Setting -->
     <string name="setting_title">设置</string>